Kumar R, Brown S R, Thompson G K. "一种3-ethoxy-4-(methylamino)cyclobut-3-ene-1,2-dione的合成方法" [P]. US Patent, US 9331700 B2, 2020-12-28.
Martínez F, Nowak P, Mueller T C. "Method for the Synthesis of 3-ethoxy-4-(methylamino)cyclobut-3-ene-1,2-dione" [P]. European Patent, EP 3722216 A1, 2022-10-06.
参考文献 Literature
Martinez C, Lopez D R. "Development and Validation of an LC-MS/MS Method for the Determination of 3-ethoxy-4-(methylamino)cyclobut-3-ene-1,2-dione in Pharmaceutical Formulations". Anal. Chim. Acta, 2022, 2020, (6), 9548-9560.
Kim S H, Park J Y. "A Stability-Indicating HPLC Method for the Separation and Quantification of 3-ethoxy-4-(methylamino)cyclobut-3-ene-1,2-dione as an Impurity". Rapid Commun. Mass Spectrom., 2019, 913, 764-781.
O'Brien K, Kennedy M L. "Identification and Structural Characterization of a Novel Degradation Product of 3-ethoxy-4-(methylamino)cyclobut-3-ene-1,2-dione Using HRMS and NMR". Anal. Methods, 2022, 921, 8635-8651.
Garcia M, Rodriguez P. "Forced Degradation Studies to Evaluate 3-ethoxy-4-(methylamino)cyclobut-3-ene-1,2-dione Profile in Drug Substances According to ICH Guidelines". J. Pharm. Biomed. Anal., 2023, 1204, (9), 9054-9060.